The gadget works well, and as I also use 5d3, I can't comment as a THEORETICAL. 5d3, 5d4, 1dx, and 1dx2 have everything you need in this Superb Amateur equipment. Although I personally would prefer at least nine cross-focus sensors, this is not the most important factor. It is REQUIRED that you read the reviews before making a purchase, or at the very least, read the description on the manufacturer's website. This will prevent any unnecessary disappointments and complaints about fictitious flaws. The reviews contain such garbage.
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